Which system covers, shapes, and supports skeletal tissue?

The muscular system is crucial for covering, shaping, and supporting the body's skeletal tissue. Muscles attach to bones through tendons, allowing movement and providing stability to the skeletal framework. This relationship helps maintain posture and enables various physical activities. The muscles work in coordination with the skeletal system, providing not only mobility but also physical structure and protection for the bones.

In contrast, the other systems listed play different roles within the body. The endocrine system is responsible for regulating bodily functions through hormones, the lymphatic system focuses on immune response and fluid balance, and the digestive system is involved in the processing of food and nutrients. None of these systems are primarily responsible for the physical support and shape of skeletal tissue as the muscular system is.